Haden says: Every day, would-be entrepreneurs let hesitation and uncertainty stop them from acting on an idea. Fear of the unknown and fear of failure are what stopped me, and may be what stops you, too.To which I would add, it's not just the entrepreneurs.
The final sentence in the article says it all: You certainly won’t get it right all the time, but if you let “idea” stay a noun, you will always get it wrong.
It reminds me of the Wayne Gretzky contribution: you miss 100% of the shots you don't take.
Haden's advice: try trusting your analysis, your judgement, and even your instincts a little more.